Louis Armstrong New Orleans International Airport started 2013 with a gain in passenger traffic over the previous year, according to figures released today.

Traffic was up 2.3 percent in January, with 676,663 passengers arriving or leaving the airport compared with 661,584 a year earlier.

The number of enplaned passengers on domestic, international and charter flights — those leaving the airport — was nearly unchanged at 328,582 compared with 328,744 in 2012. The number of deplaned passengers — those arriving at the airport — was up 4.6 percent to 348,081 from 332,840.

Among domestic carriers, Southwest led all airlines in January with nearly 33 percent of all passengers. The airline had 224,336 passengers in January, a 2.8 percent increase from the 218,232 passengers a year earlier.